2024-03-29T01:30:18Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00011569
2023-11-17T02:06:02Z
879:1183:1184:1234
Tunguska event recorded in a tree trunk
樹木年輪にみられるツングースカイベントの影響
米延, 仁志
80738
Yonenobu, Hitoshi
80739
竹中, 千里
80740
Takenaka, Chisato
80741
1999-03
A cross-cut disk of Picea which had survived from the Tunguska event in 1908,was used to reconstruct the past vegetation before and after the occurence of the event. The annul ring width had drastically decreased since AD 1909,the next year of the event, for 4--5 year, and then increased rapidly leading the decay variation observed usually in secondary growth of coniferous trees. The formar would be caused by the serious trauma in the organs such as leaf, branch, and root system due to the blast of the event. The uniseriate traumatic resin ducts were observed in the xylem formed in 1910 to suggest the occurrence of the trauma. The latter suggests the decrease of plant-sociological competition and the eutrophication of soil by forest fire. The extreme compression wood cells with spiral thickenings and cracks inside were observed in the wide rings formed in 1909-1913 possibly indicating the sudden change of light environment. Δ ^<14>C values of the annual rings formed in 1908-1910 were measured with Tandetron accelerator mass spectrometer at Dating and Materials Research Center, Nagoya University. Δ ^<14>C values were ranging from -28.2 to -1.5‰.
第11回名古屋大学タンデトロン加速器質量分析計シンポジウム(平成10 (1998)年度)報告 名古屋大学タンデトロン加速器質量分析計第1号機の研究実績と1号機,2号磯の利用計画
departmental bulletin paper
名古屋大学年代測定資料研究センター 天然放射性元素測定小委員会
1999-03
名古屋大学加速器質量分析計業績報告書
10
29
32
jpn
http://ci.nii.ac.jp/naid/110000475566/
名古屋大学年代測定資料研究センター 天然放射性元素測定小委員会
本文データは学協会の許諾に基づきCiNiiから複製したものである